Polymer with high inducible birefringence undergoing very rapid permanent change on intensive irradiation

摘要

Polymers (I) are claimed, in which birefringence can be induced by pre-treatment and can be varied by exposure to light for 10<-3> to 10<-15> seconds. Also claimed are (I) films; substrates coated with (I) films; and the use of films of photo-addressable polymers (II) with a birefringence DELTA n of 0.001-0.95 for storing optical data by partial variation of the birefringence.